Automatic white level control for a RIS

Details Automatic white level control for a RIS Automatic white level control for a RIS

1984-10-25

1987-03-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 250578, H04N 1040

Patent

active

046479813

ABSTRACT:
A circuit for correcting a raster input scanner or raster output scanner is described. During calibration, a calibration strip is scanned, the output of the light detector is compared to a reference voltage, and the difference is saved. This is a closed loop so that the difference value will settle at a value such that the detector output will accurately match the reference value before the final difference value is stored. In one mode, the correction is applied to one dynode of the PMT light detector, which varies the gain without varying the bandwidth of the circuit. The difference voltage is analog, but is stored in a digital memory through the use of A to D and D to A converters.

REFERENCES:
patent: 4287536 (1981-09-01), Wiggins
patent: 4314281 (1982-02-01), Wiggins et al.
patent: 4329717 (1982-05-01), Logie et al.
patent: 4338020 (1982-07-01), Yukawa et al.
patent: 4383275 (1983-05-01), Sasaki et al.
L. W. Bassetti et al, "Illumination Regulation for Array Scanner", IBM Tech. Discl., vol. 22, No. 8A, Jan. 1980, p. 3131.
K. A. Bushw, "Automatic Calibration of Scanner Compensation Apparatus", IBM Tech. Discl. Bulletin vol. 24, No. 3, Aug. 1981, pp. 1652-1654.
G. M. Mechalek, "A Novel Automatic Gain Control Method for Image Input Terminals", IBM Tech. Discl. Bul., vol. 7, No. 1, 1-2/82, p. 53.

Affiliated with

Also associated with

Rating

Automatic white level control for a RIS does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic white level control for a RIS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic white level control for a RIS will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1020369